Method for determining modulation and coding scheme in wireless communication system, and device therefor

A user equipment determining a modulation and coding scheme (MCS) to be applied to data in a wireless communication system, the user equipment comprising:

• a transceiver unit configured to transmit and receive radio signals, and
• a processor functionally connected to the transceiver unit,
• wherein the processor is configured to:
• report, to a base station, channel state information comprising a first measurement value related to a channel state between the user equipment and the base station,
• receive, from the base station, at least one downlink reference signal,
• calculate a second measurement value related to the channel state using the received at least one downlink reference signal,
• transmit, to the base station, a specific uplink signal to request a change in a designated MCS for downlink data when the second measurement value is a preset threshold value or less compared to the first measurement value, and
• receive, from the base station, the downlink data to which a changed MCS has been applied.

A method of determining a modulation and coding scheme (MCS) to be applied to data in a wireless communication system, the method performed by a base station comprising:

• receiving, from a user equipment, channel state information comprising a first measurement value related to a change state between the user equipment and the base station,
• transmitting, to the user equipment, at least one downlink reference signal,
• receiving, from the user equipment, a specific uplink signal to request a change in a designated MCS for downlink data if a second measurement value related to a channel state calculated by the user equipment using the at least one downlink reference signal is a preset threshold value or less compared to the first measurement value, and
• transmitting, to the user equipment, the downlink data to which a changed MCS has been applied in response to the specific uplink signal.